They didn't really have a business model to begin with, they were one of those "let's create a hype and see what happens" startups, led by a guy who thinks of himself as another Steve Jobs. The problem is that their framework was buggy and not really that high performing (the idea of adding matrix transforms on every single dom element is actually not such a good idea at all). If you really wanted a very animated GUI, native is still the only option. Plus, the whole over-animated GUI trend is also starting to fade (do we really need our apps to look like flash intros of the 90s?). Later I've heard they were aiming for a flash-like IDE for their framework to generate money, this might be somewhat in line with what they're trying now. On reddit a developer who left famo.us only 6 weeks ago said he didn't know anything about this project. So I think that they are running out of money quickly and this is all made up very fast without yet having a real product or example apps.